Ok, Urkel is a close 2nd.
Actor Jaleel White was very talented as Irkle, but somewhat limited, either by the scripts or his comic skills.
I could only take his act in small doses, i.e. a few episode of Family Matters a year. That nasal voice would quickly get on my nerves.
The Dad character, Reginald Vel-Johnson and the daughter, Kellie Williams were excellent and believable in their supporting roles. The show was well done entertainment that promoted the idea of keeping the family together.
Saw him on the show ridiculousness awhile back- he’s actually a pretty smart dude, and of course talks nothing like his character- he had everyone in stitches on the show.